Final answer:
Seafloor spreading is the process that causes continents to move according to Harry Hess's theory.
Explanation:
Seafloor spreading is the mechanism proposed by Harry Hess that causes continents to move. This process involves the creation of new oceanic crust at mid-ocean ridges, which pushes the continents away from the ridge axis. As the oceanic crust moves and eventually reaches deep-sea trenches, it sinks back into the mantle, facilitating the movement of continents.
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